Double-tube pneumatic tire.



PATENTED JULY 26, 1904.

A. H. MARKS.

DOUBLE TUBE PNEUMATIG TIRE.

A/vEA/TUJQ Q7 www g 743ml* APPLICATION FILED MAR. 3. `1904:.

N0 MODEL.

PWM/55,5155. D

UNITED STAT/Es Patented July 26, 1904.

PATENTv OFFICE.

ARTHUR H. MARKS, OF AKRON, OHIO, ASSIGNOR TO THE DIAMOND RUBBER COMPANY,OF AKRON, OHIO, A CORPORATION OF WEST VIRGINIA.

SPECIFICATION forming part of Letters Patent..No. 765,670, dated July26, 1904.

Application filed March 3, 1904.

To all whom t may con/cern.- 1

Be it known that I, ARTHUR H. MARKS, a citizen of the United States,residing at Akron, in the county of Summit and State of Ohio, haveinvented a certain new and useful Improvement in Double-Tube PneumaticTires, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

This invention is an improvement in doubletube tires of the clenchertype; and it relates particularly to the stay-bolts adapted tosupplement the air-pressure in holding the outer cover or sheath inclenching engagement With the rim. The invention consists in the stayfbolt, substantially as shown and described, and in the combination ofsaid bolt with aclencher tire and rim, all of which will be definitelyset forth in the claims.

In the, drawings, Figure 1 is a transverse sectional view of a tireembodying my invention. Fig. 2 is a sectional view of a section of saidtire in the plane indicated by line 2 2 of Fig. l. Fig. 3 is a side viewof the staybolt. Fig. 4 is a perspective view thereof, and Fig. 5 is atransverse sectional view thereof.

Referring to the parts by letters, A represents the ordinaryclencher-rim, whose edges are bent into hook form, B the ordinary outercover or sheath, which is provided with hookshaped edges -and C theordinary inner tube, The stay-bolt consists of the flat threaded stem D,which passes through a correspondinglyshaped hole in the rim, and ametal plate E, to the base of which said stem is fixed. Said plate has aflat base e and diverging sides e', and said head is covered with rubberG, which is vulcanized after it has been molded around said metal head.A number of these stay-bolts are employed to hold the tire upon the rim.When serving this purpose, therubber-covered head liesbetween the innertube and the rim and also between the two edges of the sheath, in whichlatter position it acts after the fashion of a wedge to thrust saidsheath edges apart and under the overhanging edges of the rim. Theparticular shape of this rubber-covered head has much to do with itsefficiency. The

Serial No. 136,377. (No model.)

marginal edge of this rubber head is beveled or rounded outward, or, inother words, upon that side with which the inner tube engages themarginal edge of this rubber cover is beveled down to a thin edge, whereit engages with the rim and with .the sheath. This construction does notoffer any sharp edges over which the inner tube may bend sharply when itis inliated. As will be seen from Figs. 3, 1l, and 5, these thin bevelededges normally bend outward slightly, so that when this rubber-coveredhead is drawn in between the sheath edges and down upon the rim thesebeveled rubber edges will be bent upward and inward out of their normalpositions, and this will cause them to closely hug the surfaces withwhich they contact. There is therefore no possibility that the innertube may be caught or pinched between this rubber head and the partswith which it contacts. It will be also noticed, particularly in Figs.3, 4, and 5, that on the outer surface of the inclined sides of thisrubber head are outwardly-projecting ribs g. These of course engage withthe inner portions of the sheath. These ribs will be compressed ifnecessary in order to permit the head to be drawn squarely down againstthe rim between the edges and the sheath. In any event they afford arough surface be.- tween the sheath and the bolt-head, which effectuallyprevents any possible slipping of the sheath relative to 'said head.

Having described my invention, I claim 1. A stay-bolt for aclencher-tire consisting of a metal plate having outwardly-divergingsides, and a threaded stem fixed to the base of said plate, said metalplate having a rubber cover vulcanized thereon.

2. A stay-bolt for a clencher-tire, consisting of a metal plate havingoutwardly-diverging sides, and a threaded stem fixed to the base of saidplate, said metal plate having a rubber cover vulcanized thereon, whichcover has outwardly-beveled marginal edges.

3. A stay-bolt for clencher-tires, consisting of a metal plate havingoutwardly-diverging sides, and a threaded stem fixed to the base of saidmetal plate, said plate having a rubber cover vulcanized thereon, whichcover has outwardly-beveled marginal edges, the outermost parts of whichedges normally bend outward.

4f. A metal plate having outwardly-diverging sides, and a threaded stemfixed to the base of said plate, said metal plate having a rubber covervulcanized thereon, Whioh'cover has a plurality of ribs formed on itsouter inclined faces.

5. The Combination with a wheel-rim having inwardly-bent hook-shapededges, a tiresheath having the usual hook-shaped edges, and an innertube, with a stay-bolt comprising a rubber-covered plate havingdiverging sides which fit wedge-like between the inner edges I5 of Saidsheath, and a threaded bolt attached to said plate and extended inwardthrough said rim, the marginal edges of the rubber cover being beveledto a thin edge.

In testimony whereof I hereunto aiix my 2O signature in the presence oftwo witnesses.

ARTHUR H. MARKS.

Witnesses:

E. L. THURsToN, E. B. GILOHRIST.

